Moving pigeonholes by dragging
You can move pigeonholes around on the main window by dragging them. Drag with the left mouse button to move a pigeonhole. Drag with the right mouse button to copy a pigeonhole.
You can also move or copy multiple pigeonholes. Just select the pigeonholes you want to move or copy and drag the selection.
To move or copy single or multiple pigeonholes to another group, use the right click copy/paste menu.